CHEMISTRY COMMUNITY

LMendoza 2I

Also, unlike an intermediate which is immediately used right after it's formation, a catalyst only shows up at the very beginning but is used up until the very end of the reaction and it does not interfere or interact with any of the other molecules being formed in the overall reaction.

LMendoza 2I

Reversing a half-reaction means your cell potential's sign will be reversed. If the cell potential sign is not already negative, then yes reversing the sign will make the cell potential negative.

LMendoza 2I

In deltaS=nRln(V2/V1) is temperature and pressure constant or also changing? Similarly, in deltaS=nRln(P1/P2) is temperature and volume constant or changing?

LMendoza 2I

The question explicitly states that the rate law is first-order in each reactant and the overall order of the reaction rate is a second-order process.

LMendoza 2I

The cell diagram for this redox reaction is Pt(s)|OH-(aq)|02(g)||02(g)|H+(aq)|Pt(s) but why is the H+ included on the cathode side of the cell diagram?

LMendoza 2I

A heat pump heats a house in winter by extracting heat from the cold outdoors and releasing it into the warm interior. For the transfer of a given amount of heat, (a) how do the entropies of the interior and exterior of the house change (increase or decrease)? (b) Which change is greater? Assume tha...

LMendoza 2I

For any elementary reactions you will need to know if a reaction is unimolecular, bimolecular, or termolecular. -An elematary reaction is unimolecular when only one reactant molecule participates. Ex: 03->02 + 0 -An elematary reaction is bimolecular when two reactant molecules come together to react...

LMendoza 2I

What's the difference between the specific heat capacity and deltaHfus/vap?

LMendoza 2I

Hey, A catalyst is accounted for in the rate law because it speeds up the reaction. It isn't considered in a balanced chemical equation because it doesn't undergo any change, nor does it affect any of the reactants in anyway besides increasing the speed of the reaction. So basically, does the catal...

LMendoza 2I

Also quick remark, the larger the activation energy is the higher the temperature will need to be to provide sufficient energy to overcome the high activation energy. So high activation energies really depend on strong temperatures.

LMendoza 2I

Why is the rate enhancement lower at high temperatures?

LMendoza 2I

In part a of this question, when using the equation kt=1/[A]t - 1/[A]0 and rearranging it to find t as t=(1/[A]t - 1/[A]0)/k why do we need to divide [A]t by 1/16 ?

LMendoza 2I

You can also use the half life equation for a second-order reaction (t1/2=1/k[A]0) and rearrange it so that you can get k (k=1/[A]0*t1/2).

LMendoza 2I

When a metal is the reducing agent it generally means that this metal is being oxidized so the reduction potential of this metal would have to be more negative since the strongest oxidation elements have the lowest reduction potentials.

LMendoza 2I

You want to find the simplest form of this balanced half-reaction. Therefore, the simplest form of this balanced half-reaction is when n=1.

LMendoza 2I

How do we know how to order the following metals; Fe, Ag, Au, Zn, Cu, Ni, Co, and Al from strongest to lowest reducing metal?

LMendoza 2I

Do you use -deltaHfus for the system since it's releasing heat because it is freezing?

LMendoza 2I

Yes you are correct. As the temperature increases, molecules occupy more energy states so there is a higher degeneracy W.

LMendoza 2I

It depends on the formula you use and the units within the formula you use and values you are given.

LMendoza 2I

How does the Kekule structure with 6 resonance-stabilized bonds look like and why is this structure more stable?

LMendoza 2I

What's the main relationship between entropy and work that is not done as heat?

LMendoza 2I

So if Gibbs Free Energy is at a maximum or minimum, it means that the reaction is at equilibrium?

LMendoza 2I

In this question you are using S=nCpln(T2/T1):

The final units are J.K-1.mol-1 but how do the mol units not cancel out when you are multiplying (1.00mol H2O) by the molar heat capacity which has the units (J.K-1.mol-1)?

LMendoza 2I

Question: Which substance in each of the following pairs has the highest molar entropy at 298K; (d)1.0 mol Ar(g) at 1.00atm or 1.0molAr(g) at 2.00atm? According to the solution's manual 1 mol of Ar(g) at 1.00atm has a higher molar entropy because Ar(g) at 1.00atm would occupy a larger volume but I'm...

LMendoza 2I

You have to convert the 20 degrees celsius into kelvins and once you do this your temperature will be 293 kelvins. Since 100 J.s-1 and 293K both consist of 3 significant figures, then so should your answer (0.341J.K-1.s-1).

LMendoza 2I

I would assume that enthalpy is not related to an adiabatic system since energy cannot be transferred through heat in an adiabatic system but only as work. Since enthalpy occurs when heat is absorbed or released, it can't be possible for an adiabatic system to be related with enthalpy.

LMendoza 2I

In the reaction of this question, why is the heat of the reaction and the heat of the calorimeter equal to 0 (qreaction+qcalorimeter=0)?

LMendoza 2I

If Avogadro calls, tell him to leave his number.

LMendoza 2I

What are the main differences between an isolated and adiabatic system?

LMendoza 2I

There is a negative sign in this equation because energy is being lost as work when the system is expanding and this causes the internal energy of the system to decrease.

LMendoza 2I

The more bonds there is, the harder it is to break them. Therefore, more heat would be required and the heat capacity would be higher.

LMendoza 2I

Coffee in a thermos bottle would not exchange heat with it's surroundings because a thermos bottle is an isolated system. Therefore, it cannot exchange energy or matter with it's surroundings. However, the amount of time the temperature of the coffee remains hot can really depend on the type of ther...

LMendoza 2I

Hi, so I’m confused about when I should use an ice table to find acid and base equilibrium concentrations. I know you should use it when only given one molar concentration of an acid/base but other than that should I only use it when finding concentrations of weak acids and bases?

LMendoza 2I

Determine which acid in each of the following pairs is stronger and explain why: (a) HF or HCl; (b) HClO or HClO2; (c) HBrO2 or HClO2; (d) HClO4 or H3PO4; (e) HNO3 or HNO2; (f) H2CO3 or H2GeO3. For this question, I'm having trouble understanding why acids that contain a more electronegative atom typ...

LMendoza 2I

Why is it that Oxalate is a bidentate ligand and can only have a metal bond to two of its oxygen atoms when it originally has 4 oxygen atoms that all contain lone pairs?

LMendoza 2I

Hi, can someone explain to me a little more what the concept of chelating ligands is and what is it's significance?

LMendoza 2I

For each bond determine which compound has bonds with greater ionic character:
a)HCL or HI
b)CH4 or CF4
c)CO2 or CS2

Why does HCL in question a have the greater ionic character?

LMendoza 2I

Why is it that delocalized lewis structures are more stable? Also, why does it matter if a structure is more or less stable?

LMendoza 2I

Calculate the wavelength of a 275 kg single-seat electric car traveling at a speed of 125 km.hr-1. Do electric cars have wavelike properties? A. λ = 6.94 x 10-38 m , Yes B. λ = 6.94 x 10-38 m , No C. λ = 1.93 x 10-38 m , Yes D. λ = 1.93 x 10-38 m , No I know how to calculate the wavelength of this e...

LMendoza 2I

Hi, so how do you calculate the energy per photon? I tried calculating the energy per photon but I got a different answer.

LMendoza 2I

Does anyone know if the limiting reactant will always be the product with the least amount of moles but when converted into grams, will the LR be the product with the greatest amount of theoretical grams?

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